Re-grinding of Slitting knives is a very specialized process and extra care should be taken as improper grinding can cause change in:
- Microstructure of knives
- Strength of cutting edge
The above could lead to inferior quality of slitting along with a reduced life of the knives.
For slitting knives, the re-grinding should be done on a cylindrical grinding machine and the Outer diameter of all the knives should be ground at the same time.
Grinding wheel of a coarser particle size will invariable be softer and have a more open structure in order to be self dressing. This is ideal for the re-grinding of the outer diameter of the knives.
Care should be taken while synchronizing the below to obtain the proper surface finish of between 7-10 rms:
- Feed rate (depth of cut)
- Grinding wheel speed
- Slitting cutter rotation
If the above parameters are not set correctly it may result in:
- Burn marks on the blades
- Size variation between knives
- Increase in number of re-grindings required